/* 清楚所有默认样式 */
* {
	padding: 0px;
	margin: 0px;
}
/* 设置头部和尾部的默认样式 */
.header,.footer {
	height: 50px;
	background-color: #cdcdcd;
}

.footer {
	position: absolute;
	bottom: 0px;
	width: 100%;
	text-align: center;
	line-height: 50px;  /* 页脚垂直居中*/
}
ul {
	line-height: 50px;
}
ul>li {
	/* 去除开头符号 */
	list-style-type: none;
	/* 行内显示 */
	display: inline-block;
	line-height: 50px;
	text-align: center;
	margin: 0px 10px 0px 10px;
}

a {
	color: blue;
	text-decoration: none;
}

.footer>span {
	line-height: 50px;
}

.menu {
	color: red;
	width: 100px;
	position: relative;  /*设置父元素为相对定位*/
}

.menu>ul {
	display: none;
}

/* 鼠标悬停菜单上显示子菜单 */
.menu:hover>ul {
	display: block;
	line-height: 30px;
	position: absolute;
}

form table{
	margin: auto;
	text-align: center;
	margin-bottom: 100px;
}

table input[type="text"],table input[type="password"],table input[type="submit"],table input[type="button"]{
	width: 300px;
	height: 25px;
}

.title {
	text-align: center;
	padding: 50px;
}